WO2013115675A1

WO2013115675A1 - Two-stroke piston engine

Info

Publication number: WO2013115675A1
Application number: PCT/RU2012/000770
Authority: WO
Inventors: Игорь Васильевич БОЕВ
Original assignee: Boev Igor Vasilevich
Priority date: 2012-01-30
Filing date: 2012-09-20
Publication date: 2013-08-08
Also published as: RU2012103205A; RU2493386C1

Abstract

The invention relates to engine building. The essence of the invention is that in a piston engine containing a compression cylinder and working cylinders, air is pumped into the working cylinders via blow-off valves by a turbo-compressor during the exhaust stroke. Moreover, air is pumped from the compression cylinder first into pressurized air manifolds and then into the working cylinders via inlet valves during the exhaust stroke as the cylinders are scavenged, and pumping continues during the intake and compression strokes as the working cylinders are filled, and ends when the compressor piston reaches top dead centre.

Description

TWO STROKE PISTON ENGINE

The invention relates to engine building, and more particularly to reciprocating internal combustion engines.

Known axial piston engine, comprising: a cylinder block of the working section with a pair of diametrically opposed cylinders with pistons, rods and joints with connecting rods in each; the cylinder block of the compressor section with pairwise diametrically opposed cylinders with pistons, rods and joints with connecting rods in each; main shaft with hard

the inclined disks fixed on it; camshaft extending main shaft with cams; spatially swinging washers, one for each pair of cylinders with pins, mounted through bearings on the outer surface of the inclined discs; supports with levers; the cylinder head of the working section with variable volume combustion chambers, with check valves held in a closed position by air pressure from the channel, with exhaust and inlet valves with discharge cavities connected to exhaust manifolds with channels, with nozzles, pushers, rods, rockers; cylinder head of the compressor section with check valves at the inlet and

non-return valves for air injection, connected by pipelines to non-return valves at the air inlet to the combustion chambers; inlet collector; compressor; fuel pump (see the description of the invention to RF patent No. 2410555, IPC F 02 B 75/26, F 02 B 75/04, F 02 D 15/04, publication 01/27/09).

The disadvantage of this engine is that: -separated combustion chamber complicates the design and reduces reliability; - a considerable length of pressure air ducts and the arrangement of an air compression cylinder to each working cylinder, respectively, leads to a decrease in specific power per unit volume.

Known axial piston engine containing a housing mounted in the housing with the possibility of rotation in the bearings of the drive shaft with a first axis of symmetry and with a crank, cylinder block, the axis of which are parallel to the first axis of the drive shaft, pistons with connecting rods located in the cylinders, an angled washer from the second axis and with a central axle pivotally connected with a crank, while the inclined washer is pivotally connected by means of connecting rods to pistons, a cross with two axles oppositely located on the third axis, which

mounted pivotally in the housing in bearing bearings, in addition, the inclined washer is capable of swinging on two pins oppositely located on the fourth axis, which are pivotally mounted in the crosspiece in the bearing bearings, while the fourth axis is perpendicular to the third axis and intersects at a common point with the first, second and third axles, (see the description of the invention to the patent of the Russian Federation JN ° 2272920, IPC F 02 B 75/26, F 01 B 3/02, publication 03/27/2006).

The disadvantages of this engine, taken as a prototype, is

placement of the combustion chamber in the working cylinder, which leads to a delay in the start of the stroke of the working stroke and, accordingly, to a decrease in power and KPD

The task of the invention is to increase the reliability and power density of the engine.

The essence of the invention lies in the fact that a two-stroke reciprocating internal combustion engine comprises: working cylinders with pistons, connecting rods; air compression cylinder (compressor) with piston and connecting rod;

pressure air manifolds with fuel injectors; crankshaft with compressor drive gear; compressor crankshaft with driven gear; block of intermediate gears; combustion chambers with inlet, exhaust and purge valves, spark plugs;

compressor inlet and outlet air valves; boost turbine (turbocharger).

The description is illustrated by drawings, where:

in FIG. 1 shows a piston engine, a general view in longitudinal section; in FIG. 2 same, cross section aa;

in Fig.Z-the same, a cross-section in-in;

A piston two-stroke internal combustion engine contains:

- working cylinders 1 with pistons 2, connecting rods 3; - air compression cylinder 4 (compressor) with piston 5 and connecting rod 6;

-pressure air manifolds 7 with nozzles 8 for supplying fuel; -crankshaft 9 with pinion gear 10 of compressor drive 4;

crankshaft 1 1 of compressor 4 with driven gear 12;

-block of intermediate gears 13;

-combustion chambers 14 with intake 15, exhaust 16 and purge 17 valves, spark plugs 18;

-inlet 19 and outlet 20 valves of the compressor 4;

-turbine 21 turbocharger (turbocharger) (not shown in the drawings).

A piston two-stroke engine operates as follows.

The turbocharger 21 pumps air to the inlet of the volumetric compressor 4 and to the inlet of the purge valves 17. When the piston 5 is in the V.M.T. the exhaust valve 20 closes and the intake valve 19 opens. When the piston 5 of the compressor 4 moves from V.M.T. to NMT air fills the cylinder 4 of the compressor. The turbocharger 21 increases the air pressure at the initial moment of compression, which helps to reduce the working volume of the compressor cylinder 4. When the working piston 2 moves in cylinders 1 from N.M.T. to V.M.T. with purge valve 17 open, air

turbocharger 21 displaces exhaust gases from the working cylinder 1 through an open exhaust valve 16. When piston 5 reaches compressor 4 N.M.T. the inlet valve 19 closes and the corresponding the inlet valve 15 and the exhaust valve 20. At the end of the purge, the exhaust valve 16 and the purge valve 17 are closed. End of the exhaust cycle. The nozzle 8 injects fuel into the pressure air manifold 7. Air inlet and compression begins in the compressor cylinder 4, pressure manifold 7, combustion chamber 14, working cylinder 1. Start of the intake and compression cycles. When piston 5 reaches compressor 4 V.M.T. outlet valve 20 and intake valve 15 are closed. V.M.T. the compressor piston 5 corresponds to the ignition timing in the working cylinder 1, i.e., the compressor piston 5 is located in V.M.T. at the time of ignition of the fuel in the working cylinder 1. End of the intake cycle. Spark plug 18 ignites the fuel mixture. When the working piston reaches 2 V.M.T. the compression cycle ends and the stroke cycle begins. When equalizing the pressure in the working cylinder 1 and the pressure manifold 7, the inlet valve 15 opens and compressed air is released from the pressure manifold 7 into the working cylinder 1. When the working piston 2 approaches N.M.T. the intake valve 15 closes and the exhaust valve 16 opens. The exhaust cycle begins. The working gas is displaced from the working cylinder 1 through the exhaust valves 16 to the drive of the turbocompressor 21. After the pressure in the working cylinder 1 decreases, the purge valve 17 opens.

The air pumped by the turbocharger 21 displaces the exhaust gases from the cylinder 1. Reciprocating movement of pistons 2 through connecting rods 3

it is converted into the rotational movement of the crankshaft 9. The drive gear 10, the block of intermediate gears 13, the driven gear 12 are used to increase the speed of the crankshaft 1 1, providing through the connecting rod 6 the frequency of air compression by the piston 5 equal to the frequency of the strokes in the working cylinders 1. Rotation speed the crankshaft 1 1 of the compressor is directly proportional to the speed of the crankshaft 9 and the number of working cylinders 1.

The claimed invention will improve the reliability and power density of a two-stroke engine.

Claims

Claim

A two-stroke piston engine containing: - working cylinders with pistons, connecting rods;

- air compression cylinder (compressor) with a piston and connecting rod;

-pressure air manifolds with fuel injectors;

crankshaft with compressor drive gear;

-crankshaft compressor shaft with driven gear;

- block of intermediate gears;

-combustion chambers with inlet, exhaust and purge valves, spark plugs;

- inlet and outlet valves of the compressor;

- an air turbine (turbocharger), characterized in that: air is pumped by the turbocharger through the purge valves into the working cylinders during the exhaust stroke; from the compressor cylinder of the volumetric action, sequentially to the pressure air manifolds and then to the working cylinders through the intake valves during the exhaust stroke while blowing the cylinders, continues during the intake and compression strokes when filling the working cylinders and ends when the compressor reaches V.M.T., which corresponds to the ignition timing (injection for diesel engines).